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(Ffont_fill_gstring): Stop filling when a character not

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supported by the font is found.
(Ffont_shape_text): When a shape callback function returns nil,
try at most two more times with larger gstring.
(Ffont_at): Fix getting of w.  Call font_at with correct 5th
argument.
This commit is contained in:
Kenichi Handa 2007-12-25 10:36:06 +00:00
parent c1f156b73b
commit 40fb53d667
1 changed files with 30 additions and 14 deletions
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44
src/font.c
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@ -3496,8 +3496,8 @@ FONT-OBJECT may be nil if GSTRING already already contains one. */)
c = STRING_CHAR_ADVANCE (p);
code = font->driver->encode_char (font, c);
if (code > MOST_POSITIVE_FIXNUM)
error ("Glyph code 0x%X is too large", code);
if (code > MOST_POSITIVE_FIXNUM || code == FONT_INVALID_CODE)
break;
LGLYPH_SET_FROM (g, i);
LGLYPH_SET_TO (g, i);
LGLYPH_SET_CHAR (g, c);
@ -3522,15 +3522,15 @@ FONT-OBJECT may be nil if GSTRING already already contains one. */)
FETCH_CHAR_ADVANCE (c, pos, pos_byte);
code = font->driver->encode_char (font, c);
if (code > MOST_POSITIVE_FIXNUM)
error ("Glyph code 0x%X is too large", code);
if (code > MOST_POSITIVE_FIXNUM || code == FONT_INVALID_CODE)
break;
LGLYPH_SET_FROM (g, i);
LGLYPH_SET_TO (g, i);
LGLYPH_SET_CHAR (g, c);
LGLYPH_SET_CODE (g, code);
}
}
for (i = LGSTRING_LENGTH (gstring) - 1; i >= len; i--)
for (; i < LGSTRING_LENGTH (gstring); i++)
LGSTRING_SET_GLYPH (gstring, i, Qnil);
return Qnil;
}
@ -3539,7 +3539,8 @@ DEFUN ("font-shape-text", Ffont_shape_text, Sfont_shape_text, 3, 4, 0,
doc: /* Shape text between FROM and TO by FONT-OBJECT.
If optional 4th argument STRING is non-nil, it is a string to shape,
and FROM and TO are indices to the string.
The value is the end position of the shaped text. */)
The value is the end position of the text that can be shaped by
FONT-OBJECT. */)
(from, to, font_object, string)
Lisp_Object from, to, font_object, string;
{
@ -3547,7 +3548,7 @@ The value is the end position of the shaped text. */)
struct font_metrics metrics;
EMACS_INT start, end;
Lisp_Object gstring, n;
int i;
int len, i, j;
if (NILP (string))
{
@ -3569,12 +3570,27 @@ The value is the end position of the shaped text. */)
if (! font->driver->shape)
return from;
gstring = Ffont_make_gstring (font_object, make_number (end - start));
len = end - start;
gstring = Ffont_make_gstring (font_object, make_number (len));
Ffont_fill_gstring (gstring, font_object, from, to, string);
n = font->driver->shape (gstring);
if (NILP (n))
/* Try at most three times with larger gstring each time. */
for (i = 0; i < 3; i++)
{
Lisp_Object args[2];
n = font->driver->shape (gstring);
if (INTEGERP (n))
break;
args[0] = gstring;
args[1] = Fmake_vector (make_number (len), Qnil);
gstring = Fvconcat (2, args);
}
if (! INTEGERP (n) || XINT (n) == 0)
return Qnil;
for (i = 0; i < XINT (n);)
len = XINT (n);
for (i = 0; i < len;)
{
Lisp_Object gstr;
Lisp_Object g = LGSTRING_GLYPH (gstring, i);
@ -3602,7 +3618,7 @@ The value is the end position of the shaped text. */)
metrics.descent += LGLYPH_YOFF (g);
need_composition = 1;
}
for (j = i + 1; j < XINT (n); j++)
for (j = i + 1; j < len; j++)
{
int x;
@ -3970,9 +3986,9 @@ the current buffer. It defaults to the currently selected window. */)
if (NILP (window))
window = selected_window;
CHECK_LIVE_WINDOW (window);
w = XWINDOW (selected_window);
w = XWINDOW (window);
return font_at (-1, pos, NULL, w, Qnil);
return font_at (-1, pos, NULL, w, string);
}
#if 0